Comments on: obj2opengl: convert obj 3D models to arrays compatible with iPhone OpenGL ES

By: steve

steve — Fri, 03 Feb 2012 23:35:33 +0000

sorry dont have it on any sites, can email to you have called it obj2delphi.pl

By: Heiko Behrens

Heiko Behrens — Thu, 02 Feb 2012 14:16:25 +0000

Hey Steve, if you did a fork on GitHub let me know where I can find your version.

By: steve

steve — Sat, 28 Jan 2012 12:16:29 +0000

I Have solved triangle problem, depth plane was set too low, my bad, wrote component to drop opengl panel on form and left setting at 0.00001; just posting this inccase anybody else has same problem.

By: steve

steve — Sat, 28 Jan 2012 11:42:11 +0000

I read the comment from earlier about Triangle’s corrupting. can you tell me if the problem was solved, because if i use two lists and place them together one will corrupt the other when moving away from them at an angle, put them away from each other no corruption, i am using a wheel and tyre, i have reduced size of wheel no collisions , i have also tried all culling, If You have any idea’s they will be welcome. I also reexported both obj’s to make sure they were triangles.

By: steve

steve — Sat, 28 Jan 2012 05:32:20 +0000

Very good Utility, I have adapted to create a delphi unit with a procedure call draw + Name just have to had unit to uses and then call procedure to draw object if you would like copy please contact me.

By: Heiko Behrens

Heiko Behrens — Fri, 20 Jan 2012 14:18:39 +0000

Rimsan, The textual representation of these arrays (.h file) takes a lot more space then the compiled version. Did you compile that and measure the impact on the size of your binary?

By: rimsan

rimsan — Thu, 19 Jan 2012 11:06:47 +0000

13mb output *h file

By: Daniel S

Daniel S — Fri, 30 Dec 2011 19:45:26 +0000

I just struggled for 2 days to get my textures to line up correctly… I discovered that if I flip the UV image vertically, when i apply the texture to the model it displays correctly. Im not sure why I need to do this. My process to get the textures to display correctly once it looks right in Blender is:
1) Blender > UVMap> Save As Image
2) Blender > File > Export > .obj
3) Uncheck Write Materials (Not used)
4) Check Include Normals & Triangulate Faces
5) Export OBJ
6) Run script
7) Open Image in Photo Editing Software > Flip Image Vertically
Use model as previously described

Not sure if this will work for everyone but it worked for me. Good luck

By: Tanna

Tanna — Mon, 26 Dec 2011 09:07:26 +0000

hi，I‘m wonder that if the script can be used in windows ?If it can,does it need any configuration?I will be appreciate for your sharing!Thank you very much!

By: DivideByZero

DivideByZero — Thu, 08 Dec 2011 19:03:00 +0000

Sorry for the newbie question, but where should i say which is my .obj file. I went to the conclusion that its inside your script, but i can’t understand where.

Thanks for help.

By: Heiko Behrens

Heiko Behrens — Sat, 29 Oct 2011 14:25:30 +0000

Not at the moment, sorry. But feel free to fork it on GitHub.

By: Andy

Andy — Fri, 28 Oct 2011 13:28:08 +0000

Hi,
Do you have any version of obj2opengl.pl that could calculate indices (during conversion from obj to .h) so that I could use glDrawElements function?.

By: Simon

Simon — Fri, 28 Oct 2011 08:38:31 +0000

Hi,
I’m still playing with your script but I’d just like to say I think it’s very nice that you try to help almost every poster on this forum. Well done!
And thank you for sharing your experiences and knowledge with everyone.
Regards,
Simon.

By: Leandro

Leandro — Wed, 19 Oct 2011 22:26:12 +0000

Hello, congratulations for the tutorial …. I would like to know where you bring that image banana.jpg worked and how to use it along with the texture coordinates.

By: Nimesh

Nimesh — Wed, 21 Sep 2011 22:51:14 +0000

Illegal division by zero at ./obj2opengl.pl line 294 Error:

I have the same error as the other two guys:
Here is how I created by Cube model:
Open 3DSM -> new cube.
Follow any tutorials to create texture.
Export as .obj

By: openGL

openGL — Thu, 15 Sep 2011 05:48:59 +0000

Problem in OpenGL any one knows the solution for this
-> I have created a tower of hanoi problem in 3D
-> I am putting a disc on tower
-> I able to see the disc not the tower the tower is going behind
-> i dont know y it is going behind i have used glpush matrix and glpop matrix any one knows the solution
Thank you in advance

By: Shaktising

Shaktising — Fri, 09 Sep 2011 03:20:57 +0000

Hi Heiko,
I m facing the same problem which JACE has faced. I am also getting the error “Illegal division by zero at ./obj2opengl.pl line 294″ when I tried to conver my obj models.
If you want I can send the model to you.
Pls reply.

By: Heiko Behrens

Heiko Behrens — Sun, 28 Aug 2011 14:58:16 +0000

Hey Pepe, I do not have any recommendations regarding an online gallery of such models.

By: Pepe

Pepe — Sun, 28 Aug 2011 09:16:11 +0000

Hi,

Where can I find more .obj models with a single texture image like the banana sample?

Thanks.

By: Rajesh

Rajesh — Fri, 12 Aug 2011 11:12:10 +0000

Hi Heiko

I am 3d modeler. and i wants to do some ar stuff for iphone.
for that i need to export my 3ds max model to opengl code
is it possible to export 3d model from 3ds max application
how can i export. can u plz advise me step by step

Please Reply

Raj

By: Joey

Joey — Tue, 02 Aug 2011 13:14:37 +0000

I posted the log I am getting with errors… https://github.com/HBehrens/obj2opengl/issues/1

By: Heiko Behrens

Heiko Behrens — Tue, 02 Aug 2011 00:36:12 +0000

Hey Joey, without further information I have no clue either. Could you open a ticket at https://github.com/HBehrens/obj2opengl/issues/new and describe your error with log, and files if any in detail?

By: Joey

Joey — Tue, 02 Aug 2011 00:30:28 +0000

I am having a helluva time executing this script. I am running win7 64 bit and don’t know if that’s the problem or what but every time I attempt to execute this it just spits out about 80 errors and says obj2opengl.pl has to many errors.

Any ideas?

By: Alex Egg

Alex Egg — Mon, 11 Jul 2011 19:06:37 +0000

It’s interesting how the output .h files grow in size so much -why is this. At some point if you have a large enough model is this method unpractical?

By: Alex Egg

Alex Egg — Mon, 11 Jul 2011 18:19:01 +0000

I’m using this for Android opengl es 2.0 projects. Thanks for your work!

By: Heiko Behrens

Heiko Behrens — Wed, 29 Jun 2011 07:52:27 +0000

Hey Siva, unfortunately I cannot offer any reasonable advices with just this information. Did you read the various comments on the post? Does it work with the sample models? Do you .obj faces consists of triangles, only? Did you double-check that your .obj file contains texture coordinates?

By: Siva

Siva — Tue, 28 Jun 2011 12:29:14 +0000

Hi Heiko..
I tried with someOther obj files.. But the TextCoords always 0.. How To get The TextCoords ??

Pls reply..

By: Rana

Rana — Thu, 16 Jun 2011 14:27:55 +0000

hey heiko i mapped the texture on the model but unfortunately it isn’t good as the texture doesn’t exactly match the vertices and i tried more than one model with different textures and still the same problems
so any Ideas plz ?!

By: Kevien

Kevien — Fri, 10 Jun 2011 12:22:10 +0000

Hey,plz i cann’t load the texture and the link u loaded didn’t also load it,,would u plz load the code for texture u used

By: Heiko Behrens

Heiko Behrens — Tue, 07 Jun 2011 20:48:53 +0000

Hey Rana, if you want to google for it, the terms are “run perl shell script”. Also there are several answers on similar questions throughout the comments. Regarding animations: I am not aware of any file format the iOS SDK understands out of the box. Since the .OBJ file format handles static meshes only, the script obj2opengl.pl cannot help you with that either. On the other hand, there are plenty of feature-rich 3D libraries for iOS out there, some of them can handle animations, too.

By: Rana

Rana — Mon, 06 Jun 2011 22:22:39 +0000

Hey does i-phone supports any 3D model format supports animation,,as i wanna load an animated model

By: Rana

Rana — Mon, 06 Jun 2011 09:45:45 +0000

Hey Heiko could u please tell me how to use your script as i’m a beginner and wanna use it

By: Heiko Behrens

Heiko Behrens — Sat, 28 May 2011 10:32:08 +0000

Hey Gyan, this is actually real banana peel. Roll it out, take a picture and give it final touches in Photoshop – voilà!

By: Gyan

Gyan — Tue, 24 May 2011 16:19:40 +0000

hi heiko, i have problem to make a texture ( ex : banana.jpg ). what tools you use to make the this texture.png??

By: Heiko Behrens

Heiko Behrens — Thu, 28 Apr 2011 08:06:00 +0000

Thank you for your feedback, Praveen. Could you be more specific on the difference beetween NumVerts and Vertices? Is the output wrong? What do you expect instead? Do the samples work for you? Could you provide a sample .obj I could test against? Feel add a new issue on GitHub or write another comment, here.

By: Praveen

Praveen — Wed, 27 Apr 2011 11:06:35 +0000

Hi Heiko

This is a beautiful script. Worked nicely. I am a bit confused because the script output for Vertices is different then the NumVerts variable that you generate for code.

Haven’t looked at the codeas yet though but this is slightly confusing.

Thanks a lot for the script though.

By: Heiko Behrens

Heiko Behrens — Thu, 24 Mar 2011 02:43:36 +0000

It might work out to put the arrays into a .c/.m file that’s been compiled only once and access their addresses via a function. Only this function prototype then remains in the .h file. Haven’t tried this out, though.

By: Molma

Molma — Thu, 24 Mar 2011 00:19:00 +0000

hey i have been wondering, is there a way to make the compiling process quicker? im making a PC game, but the compiling takes about a minute and a half…is there a way to maybe skip the header reading?

By: Heiko Behrens

Heiko Behrens — Wed, 23 Mar 2011 19:02:13 +0000

Hey Rassall, I cannot test the script on a windows machine at the moment. As a workaround, you could probably comment out the configuration of that parameter if you don’t rely on the -center argument.

By: Rassall

Rassall — Wed, 23 Mar 2011 08:22:12 +0000

Hello,

I am facing problem o run this perl scrip obj2openl.pl. I open my widnows xp command promt then go to the script (ob2opengl)directory. I write following command:

perl obj2opengl.pl cube.obj

But i Receiving two error

error in option spec: “centre=f{3}”
error in option spec: “ARRAY(01ad2c60)”

I also try in cygwin to run this cript by follwing command:

./object2opengl.pl cube.obj

but i got following error:

bash:./obj2opengl.pl…….permission denied

i hardly need obj converter to .h file for my 3d file.

Any Idea how i can execuite this obj2opengl.pl script in my windows xp pc.

thanks

Rassall

By: Heiko Behrens

Heiko Behrens — Tue, 08 Mar 2011 18:24:35 +0000

Hey dwi, there’s no magic at all. Just execute the script from the command line as I wrote on this post. It might be necessary to add the execution flag to the script, though. Try chmod +x obj2opengl.pl to do so before running it.

By: dwi

dwi — Tue, 08 Mar 2011 18:07:51 +0000

Hi Heiko
I really appreciate your works.
I’m an iphone developer , but I am very inexperienced in perl
will you teach me how to use obj2opengl.pl step by step

thank you

By: Heiko Behrens

Heiko Behrens — Mon, 07 Mar 2011 20:27:39 +0000

Hey Sen, at the moment, the script only supports textures to color vertices. You could either use textures instead of solid colors or enhance its functionality. I’d be happy to pull your commit!

By: sen

sen — Mon, 07 Mar 2011 09:30:56 +0000

In my 3d model, i used 3 cylinders with different colors for each cylinder, when i am rendering that 3d model into my phone, three colors are not appearing only one single color is appearing for whole 3d object. just i apply different colors to the different cylinder, i think it is not the texture how can i render into my phone, plz can u help me out

By: Heiko Behrens

Heiko Behrens — Fri, 04 Mar 2011 09:56:12 +0000

Hey Sen, I am using a concept called “textures” with that examples. Have a look at the OpenGL Tutorials I referred to earlier to learn how those work. Good luck!

By: sen

sen — Fri, 04 Mar 2011 09:08:23 +0000

In the banana example i had seen many colors in that object like yellow, light black. in the similar way my obj file contains 3 colors, i created aheader file using ur perl script and included it in my application and it is not showing all the 3 colors can u help me out .

By: Molma

Molma — Sat, 26 Feb 2011 01:09:57 +0000

alright i just tried putting your banana into my project, its having the same effect….its probably the way i setup my code

can you check this and see if you can point something out?

http://pastebin.com/PSaL8TwA

By: Molma

Molma — Sat, 26 Feb 2011 01:01:16 +0000

hmm…if its the triangle problem then it might be the fact that i started out with squares and then changed them to triangles.

im going to try the example out just to see what happens.

also i did my model in blender if that helps

By: jacks8x

jacks8x — Thu, 24 Feb 2011 02:52:16 +0000

I used opengl es template in Xcode to create a project, then i import sphere.h file which was created from your script and then followed the code you suggest,then the sphere became something like an egg (not sphere). But when i use another project (i found it on the internet but i don’t remember the site i found it) not opengl es template in Xcode and everything is ok. So I think maybe there is something wrong in the code??

By: sen

sen — Tue, 22 Feb 2011 11:20:57 +0000

Thank u, can u tell me what is the information i need to gather plz tell me briefly, it will help me.